Which of these is a step that must be taken to define the data used in a report?

• A. Define the types of statistics to be shown.
• B. Confirm the specific codes used to define variables such as site, morphology, and stage.
• C. Determine the method of distribution.
• D. Obtain approval for data usage.

Answer: (B)

Standardizing data definitions through codes is essential. The step that must be taken is confirming the specific codes used to define variables such as site, morphology, and stage. Establishing a data dictionary or codebook ensures every analyst uses the same values for each variable, so a site category or morphology code means the same thing across datasets. This consistency enables accurate aggregation, comparison, and reproducibility of the report's findings. Without agreed codes, different sources might label things differently, leading to misinterpretation or errors in analysis. Other steps like choosing which statistics to display, deciding how to distribute results, or obtaining data usage approvals relate to analysis plans, dissemination, and governance rather than defining the actual data elements.